I started becoming familiar with slide and negative film scanning yesterday with a mid-range scanner (unfortunately the used high-end Nikons are pricey these days, so I bought a reflecta a couple of years ago). Unfortunately, Linux support is not ready yet, so I use VueScan on Windows to obtain the image data. However, I want to do as much as possible of my workflow on Linux with FLOSS software. Therefore, I wonder if there is already some software, plugin or at least algorithm that can make use of the infrared channel data that is stored as alpha channel in the resulting tiff file to remove scratches.
Unfortunately, I did not find something on the web. I guess G’MICs inpainting algorithms could be helpful, but they are not exactly tailored to the problem or the input data format. Is there something I overlooked?
I can provide a sample scan later today if this helps.
Update: Sample file can be found here, but it’s large (150 MB).